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MIC2593-2BTQ Datasheet(PDF) 11 Page - Micrel Semiconductor |
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MIC2593-2BTQ Datasheet(HTML) 11 Page - Micrel Semiconductor |
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11 / 26 page  Micrel, Inc. MIC2593 September 2008 11 M9999-092208 Functional Description Hot Swap Insertion When circuit boards are inserted into systems carrying live supply voltages (“hot-plugged”), high inrush currents often result due to the charging of bulk capacitance that resides across the circuit board’s supply pins. This transient inrush current can cause the system’s supply voltages to temporarily go out of regulation, causing data loss or system lock-up. In more extreme cases, the transients occurring during a hot plug event may cause permanent damage to connectors or on-board components. The MIC2593 addresses these issues by limiting the inrush currents to the load (PCI Board), and thereby controlling the rate at which the load’s circuits turn-on. In addition to this inrush current control, the MIC2593 offers input and output voltage supervisory functions and current limiting to provide robust protection for both the system and circuit board. System Interfaces The MIC2593 employs two system interfaces: the hardware Hot Plug Interface (HPI) and the System Management Interface (SMI). The HPI includes ON[A/B], AUXEN[A/B], as well as /FAULT[A/B]; the SMI consists of SDA, SCL, and /INT, whose signals conform to the levels and timing of the SMBus specification. The MIC2593 can be operated exclusively from the SMI, or can employ the HPl for power control while continuing to use the SMI for access to all but the power control registers. In addition to the basic power control features of the MIC2593 accessible by the HPI, the SMI also gives the host access to the following information from the part: 1. Fault conditions occurring on each supply. 2. GPI[A/B] pin status. When using the System Management Interface for power control, do not use the Hot Plug Interface. Conversely, when using the Hot Plug Interface for power control, do not execute power control commands over the System Management Interface bus (all other register accesses via the SMI bus remain permissible while in the HPI control mode). When utilizing the SMI exclusively, the HPI input pins ON[A/B] and AUXEN[A/B] should be tied to ground as shown below in Figure 6 (Disabling HPI when SMI control is used). This configuration safeguards the power slots in the event that the SMBus communication link is disconnected for any reason. Additionally, when utilizing the HPI exclusively, the SMBus (or SMI) will be inactive if the input pins (SDA, SCL, A0, A1, and A2) are configured as shown in Figure 6 below (disabling SMI when HPI Control is used). Power-On Reset and Power Cycling The MIC2593 utilizes VSTBY[A/B] as the main supply input source. VTSBY[A/B] is required for proper operation of the MIC2593 SMBus interface and registers and must be applied at all times. A Power-On Reset (POR) cycle is initiated after VSTBY[A/B] rises above its UVLO threshold and remains valid at that voltage for 500µs. All internal registers are cleared after POR. If VSTBY[A/B] is recycled, the MIC2593 enters a new power-on reset cycle. VSTBY[A/B] must be the first supply input applied followed by the MAIN supply inputs of 12VIN, 12MVIN, 5VIN, and 3VIN. The MAIN supply inputs may be applied in any order. The SMBus is ready for access at the end of the POR interval (500µs after VSTBY[A/B] is valid). All outputs remain off during tPOR. MIC2593 A2 /INT SDA SCL A0 VSTBY A1 100k 47 48 37 39 40 41 100k Disabling SMI when HPI Control is used Disabling HPI when SMI Control is used 100k /INT AUXENA AUXENB ONA ONB MIC2593 45 42 44 43 Figure 6. Input Pin Configuration for Disabling HPI/SMI Control |
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